SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd70f3c5343451f3211e993b4cefcc498f9e55a25101b49025e7ec6992b4efbe' 
  AND token = 'HQVBFWbZWU/ECyzTLJ8UAGZ/U7KkXTLo/2wCEAh+p0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}